【摘要】：為了對軸流式止回閥門結(jié)構(gòu)進(jìn)行優(yōu)化,采用RNG k-ε模型、轉(zhuǎn)捩SST、轉(zhuǎn)捩K-Kl-ω共3種模型對鈍體繞流的邊界層分離狀態(tài)及壁面摩擦阻力進(jìn)行數(shù)值計(jì)算,并與試驗(yàn)數(shù)據(jù)進(jìn)行對比.結(jié)果表明:3種模型均能對邊界層分離狀況進(jìn)行正確模擬,其中轉(zhuǎn)捩K-Kl-ω模型計(jì)算出的旋渦形狀與試驗(yàn)結(jié)果更為接近;傳統(tǒng)的RNG k-ε模型不能反映轉(zhuǎn)捩過程及轉(zhuǎn)捩前后壁面摩擦阻力的變化,但建立在湍流度經(jīng)驗(yàn)理論之上的轉(zhuǎn)捩SST、轉(zhuǎn)捩K-Kl-ω這2種模型均能計(jì)算出轉(zhuǎn)捩所引起阻力變化情況,且2種模型的計(jì)算結(jié)果與試驗(yàn)結(jié)果一致,并將數(shù)值計(jì)算的流阻系數(shù)與實(shí)測數(shù)據(jù)進(jìn)行比對,其中轉(zhuǎn)捩K-Kl-ω模型計(jì)算所得到的閥門流阻系數(shù)相對誤差為7%,比傳統(tǒng)的RNG k-ε模型更為準(zhǔn)確.在驗(yàn)證計(jì)算模型可靠性的基礎(chǔ)之上,利用轉(zhuǎn)捩K-Kl-ω模型對軸流式止回閥的結(jié)構(gòu)進(jìn)行了優(yōu)化,發(fā)現(xiàn)光滑漸擴(kuò)型流道的減阻效果最佳.
[Abstract]:In order to optimize the structure of axial flow check valve, RNG k- 蔚 model and transition SST, transition K-Kl- 蠅 model are used to calculate the boundary layer separation state and wall friction resistance of blunt body. And compared with the test data. The results show that the boundary layer separation can be simulated correctly by the three models, and the vortex shape calculated by the transition K-Kl- 蠅 model is closer to the experimental results. The traditional RNG k- 蔚 model can not reflect the transition process and the change of friction resistance of the wall before and after the transition, but the transition SST, is based on the empirical theory of turbulence. The two models of transition K-Kl- 蠅 can calculate the change of resistance caused by transition, and the calculated results of the two models are in agreement with the experimental results, and the flow resistance coefficient calculated by numerical method is compared with the measured data. The relative error of the flow resistance coefficient of the valve calculated by the transition K-Kl- 蠅 model is 7, which is more accurate than the traditional RNG k- 蔚 model. On the basis of verifying the reliability of the calculation model, the structure of axial flow check valve is optimized by using the transition K-Kl- 蠅 model. It is found that the drag reduction effect of smooth gradual expansion channel is the best.
【作者單位】： 蘭州理工大學(xué)石油化工學(xué)院;福建省特種設(shè)備檢驗(yàn)研究院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51076061) 國家質(zhì)量監(jiān)督檢驗(yàn)檢疫總局科技計(jì)劃項(xiàng)目(2014QK035)
【分類號】：TH134

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